Server Alarms - Avaya Support

Far CSU Loopback Test (#1213)
Enter busyout board to busy out all trunks or ports on the DS1 Interface circuit pack before
running the Far CSU Loopback test.
If the DS1 is administered for ami-zcs line coding and the far-end CSU is not a 120A CSU
module or a 401A T1 sync splitter, density protection on the CSU must be disabled during the
test due to the large number of zero’s in the 3-in-24 test pattern.
The Far CSU Loopback test has the DS1 Interface circuit pack transmit a loopback activation
code to the remote CSU, waits up to 15 seconds for return of the code to verify the loopback
has been established, transmits a framed 3-in-24 test pattern, begins counting bit errors in the
received test pattern, and returns a PASS result. If the loopback is not established within the 15
seconds, the test fails.
The status of the Far CSU Loopback test appears in the error log as Error Type 3901. Several
aux values give information on the status of the test.
Enter list measurements ds1 summary to show the length of time the test has been running
(Test Duration field) and number of bit errors detected (Loopback/Span Test
Bit-Error Count field). If the test pattern is passed through the loopback cleanly, the
number of bit errors should be very low. The command also shows the type of loopback/span
test executing (Test field), the type of pattern generated for the loopback/span test (Pattern
field), and whether the pattern (i.e., 3-in-24 Pattern) is synchronized (Synchronized field).
Enter test ds1-loop location end-loopback/span-test to end the test.
Enter release board location to restore all trunks or ports on the DS1 Interface circuit
pack to the in-service state.
This test is run on the DS1-BD (DS1 Interface Circuit Pack) and UDS1-BD (UDS1 Interface
Circuit Pack) maintenance objects.
Table 581: Far CSU Loopback Test (#1213) 1 of 3
Error
Code
Test
Result
Description / Recommendation
ABORT Internal system error
1. Run test ds1-loop location
far-csu-loopback-test-begin at 1-minute intervals up to 5
times.
1005 ABORT Far CSU Loopback test cannot be executed in the current configuration. To
run this, the DS1 must be administered for 24-channel operation. The Bit
Rate field on the DS1 circuit pack administration screen must be set to
1.544 for 24-channel operation.
1 of 3
Communication Manager Release 5.0 Issue 4 January 2008 1937